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It has been observed that some persons who suffer acute heartburn, again suffer acute heartburn within one year of the first episode. This is due, in part, to damage from the first episode. The performance of a new drug designed to prevent a second episode is to be tested for its effectiveness in preventing a second episode. In order to do this two groups of people suffering a first episode are selected. There are 190 people in the first group and this group will be administered the new drug. There are 136 people in the second group and this group wil be administered a placebo. After one year, 19% of the first group has a second episode and 13% of the second group has a second episode. Select a 95% confidence interval for the difference in true proportion of the two groups.
a) [-0.139, 0.019]
b) [-0.044, 0.164]
c) [-0.164, 0.044]
d) [-0.019, 0.139]
e) [-0.519, 0.639]
f) None of the above
Borst et.al. investigated the relation of ego development, age, gender, and diagnosis to suicidality among adolescent psychiatric inpatients.
Suppose that we are interested in the proportion of the 70 students in the lunchroom cafeteria that smokes. Is the normal approximation for the proportion p = r/n valid?
You are thinking of employing a t-procedure to test hypotheses about the mean of a population using a significance level of 0.05.
The Quick Change Oil Company has a number of outlets in the Seattle area. The daily number of oil changes at outlet in past twenty days are:
The size of the home (reported below in thousands of square feet) increases the selling price (reported in $ thousands) also increases?
A. What is the standard deviation?
IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.
What is the appropriate inferential statistical test for the case scenario? Why?
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Compare the vital capacityfor the two groups.calculate a 99% confidence interval for the difference.the result of this comparison may be misleading.why?
the mean annual salary for chauffeurs is 21000. a random sample of size 45 is drawn from this population. assume that
The manager of a service station is in the process of analyzing the number of times car owners change the oil in their cars. She believes that the average motorist changes his or her car's oil less frequently than recommended by the owner's manual (t..
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